Gas-mixer.



D. D. FOWLER.

GAS MIXER.

APPLICATION FILED SEPT. 30. 1915.

1,178,509. Patented Apr.v 11, 1916,

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THE COLUMBIA PLANOGRAPH co.. WASHINGTON. D. c.

DUDLEY D. FOWLER, F KANSAS CITY, MISSOURI.

GAS-MIXER.

clear, and exact description of the invention,

' such as will enable others skilled in the art to which it appertains to make and use the same, reference being had'to the accompany-v ing drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to a gas mixer and more particularly to a device of that character comprising a chamber into which air and gas are delivered separately to comingle and form a fuel mixture, the object of the present invention being to providey means for automatically regulating the admission of air to the chamber in proportion to the intake of gas for any opening of the gas valve. In accomplishing this object I have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein:

Figure I is a side elevation of amixer containing my improvements, the dotted lines indicating a maximum intake of gas and air. Fig. II is a central longitudinal section of the same. Fig. III is a plan view of the same. Fig. IV is a cross section on the line IV-IV, Fig. I. Fig. V is a longitudinalcentral section of-part of the mixing` chamber, showing the air valve open.

Y Fig. VI is a cross section on the line VI-VI,

Fig. I, particularly illustrating the cam member for actuating the air valve fromV the gas valve stem. v

Referring more in detail to the drawing: 1 designates a mixing chamber which may be suitably mounted on a burner conduit, indicated by the tube 2 in any suitable manner and having a closed outer end 3, provided with a central aperture 4 into whichris threadedcthe neck-5 of a valve housing 6,

and/having an`\a-pertu`re 7thereinprovided "with a tapered seat 8, through which air may be admitted to the mixer.

The valve housing 6 has a bore 10 extending therethrough and provided with an enlargement 11 in its neck, within which is seated a plug 12, containing a tapered channel 13 for seating a needle valve 14, that is formed on a stem 15. The stem 15 is con- Speccation of Letters Patent.

Application filed September 30, 1915. Serial No. 537,400.

tained iwithin the longitudinal bore `10 and -has a triple thread connection with the wall of the-bore, in order to accelerate movement of the needle valve t0 and from its seat when the stem is revolved, the outer end of the stem being equipped with a suitable handle 16 whereby the valve may be manipulated.

`The housing Gis provided with a nipple 18, containing `a bore 19 that extends into the stem to communication with the enlargement 11, of the bore 10, and is preferably extended through the nipple at an angle in order to deliver in the direction of the mixer and facilitate iiow of gas into the mixing chamber, the nipple being provided with a threaded neck 20 to which a suitable tube or conduit may be attached. The valve housing neck 5 is preferably provided with mixer 1 and with a gland 22 which threadsv onto the outer end of the housing to confine packing of a suitable nature about the valve stem and prevent leakage.

vPivotally mounted on an ear 23, on the housing 6, is a lever 24, having a curved neck 25 at its forward end, provided with a downwardly facingvalve head 26 that is adapted to seat in the tapered seat 8 of the mixing valve and is provided with a cap 28 that lies over the valve to completelyv clo-se the air port, the channel housing being built up by a boss 29 to form a flatbearing surface for the capV 28 and an even, eective seat for the valve head 26.

The rear end of the lever 24 is projected into at cam slot 30 in a segment 31, having a hub 32 fixedV to the valve stem 15 by a set screw 33 or the like, the cam slot being ci rcular, but-eccentric `relative to the stem 15, in order to move the end of the arm 24 toward or from the valve stem, as the latter is revolved and thereby rock the arm on its pivotal mounting to move the air valve head toward orffrom its seat according to the direction of the movement ofthe `valve stem. 'lhefsegmerV 31 is adjustably mounted on the valve stem 15 by means of the l`--setscrewso'thatthesegment may be moved toward and from the fulcrum of the lever' 24, and the slot 30 extends entirely through the segment so that the segment may be and relative to the lever arm, it is apparent that where a greater or less amount of air is required for a given quantity of gas, the

"ment may be moved along the valve stem in the proper direction to vary the proportionate movement of the air valve, so that a greater movement of the stem is required for a certain quantity of air when the segment is in an outer position, than is required when the segmei'it is in an inner position, the opening through the segment Vpermitting' the latter to slide along the lever arm to provide a wide range oi' adjustment.

Assuming that the parts are constructed and assembled as described, with the neck 2'() et the valve housing connected with a source of gas supply (not shown), it is apparent that when the needle valve is in closed position, iow of gas to the mixer is shut oit and that, with the segment 31 properly arranged on the gas valve stem, the air valve will seat snugly against the tapered seat of the air port. When it is desired to admit a 'fuel mixture to the mixer, ior supplying a burner or the like, the gas port is opened by turning the handle 16 to move the stem on its threaded mounting and withdraw the needle valve from its seat, to form an opening to the tapered channel 13 so that gas may he delivered to the mixing chamber.

As the segment 31 is fixed rigidly to the valve stem, movement of the stem carries the segment about with the stem, and as the air valve lever 24 is anchored against rotary movement, the segment moves the free end of the lever and rocks the lever inwardly by trictional engagement of the sides of the cam slot with the end of the lever. rThis pivotal movement of the air valve lever rocks the valve head 26 upwardly upon downward movement of the opposite end of the lever and removes the head from its seat, forming an opening into the mixing chamber through which air may pass to comingle with the gas admitted through the valve housing, to form a fuel mixture. is apparent that any movement of the valve stem will effect a like movement of the air valve, so that as' the opening of the gas port is increased the opening of the air port is increased in like proportion, to eiiect a proper balance of the gas and aii1 for any degree of opening of the gas port.

Having thus described my invention, what l claim as new therein, and desire to secure by Letters-Patent, is:

1. A gas mixer comprising gas and air intake ports, a. valve for controlling one ol said ports, and comprising a rotary stem, a member adjustably mounted on said stem and having a cam slot extending ther',- through, a valve Jfor controlling the other port, and a lever connected with said last named valve and having an arm slidahly projected into the cam slot in the member on said stem, whereby the said member may be moved along the arm to vary the leverage length of the arm.

:2. A gas mixer comprising gas and air intake ports, a valve for controlling the gas port, comprising a rotary stem, a segment having a hub mounted Jfor longitudinal adjustment on the stem, and having a cam slot, a valve for controlling the air port and comprising pivotally mounted lever, having` an arm slidably projected into the slot in said segment, and a handle for said valve stem whereby the stem and the segment are operated synchronously to eiiect synchronous operation of said valves.

In testimony whereof l ailix my signature.

DUDLEY D. FOVVLER.

Copies of this patent may be obtained for ve cents each, by addressing the "Commissioner of Patents.

Washington, D. C. 

